如何提高青少年篮球比赛中掩护配合的质量

在篮球比赛中，掩护进攻是一种进攻的方式，好的掩护可以打乱对方的防守阵形，在一定程度上改变场上的局面，获得更多的进攻机会。青少年的篮球比赛就其性质而言，掩护配合在一定程度上运用的机会较为多一些，而如何提高掩护的质量，加强进攻的实效性是关键所在。经济贸易     

青少年排球二传的培养和训练

文章介绍了青少年排球二传队员的选材条件和技术、意识及训练的要求和方法,强调了二传队员的重要地位和作用,指出其培养和训练应从青少年抓起。     

谈青少年业余运动员的力量训练

对青少年业余运动员力量训练的作用、影响因素和训练方法进行探讨,提出力量训练要针对青少年的身心特点和专项要求,长期坚持,重视质量,其效果取决于计划的系统性和训练方法的选择。     

Juvenile hormone titre and regulation in the cockroachDiploptera punctata

Summary Titres of juvenile hormone (JH) have been determined in both hemolymph and whole body extracts of femaleDiploptera punctata during the first gonotrophic cycle using a method employing gas chromatography/mass spectrometry for qualitative and quantitative analysis. JH III is the sole JH found in both adult and last instarD. punctata. Maximum values of 1500 ng/ml (6M) were observed at the middle of the gonotrophic cycle, when basal oocyte growth rate was greatest. Changes in rates of JH release in vitro by corpora allata paralleled closely the changes in JH titre, suggesting that biosynthesis is a major regulator of titre. JH levels per animal were calculated from observed JH titres, and at certain time points in the gonotrophic cycle JH levels obtained from analysis of whole bodies were significantly greater than those predicted from hemolymph titres. These results suggest the existence of a nonhemolymph JH pool inD. punctata. Decay in JH titre after allatectomy of 5 day females has also been studied. Following a rapid initial decline, the rate of decay slowed appreciably 4 h post-operation. Thus, use of a first-order rate constant to estimate half-life of JH significantly underestimated the longevity of the hormone. The apparent persistence of JH following allatectomy may be due to the existence of a nonhemolymph JH pool.     

不同盐度下奥尼罗非鱼幼鱼生长的研究

在盐度分别为0、1%、2%和3%的水体中进行奥尼罗非鱼幼鱼的对比养殖.实验结果表明,盐度对奥尼罗非鱼幼鱼的生长具有高度显著的影响(P<0.01);对奥尼罗非鱼幼鱼的成活率和肥满系数无显著的影响(P>0.05);对奥尼罗非鱼幼鱼的总摄食量、饵料系数及粪便中总氮量有显著影响(P<0.01).此外,奥尼罗非鱼幼鱼生长的最适水体盐度为1%.     

海水养殖鲈鱼分离出一种hepcidin抗菌肽新基因

利用分子生物学技术,从我国海水养殖鲈鱼(Lateolabraxjaponicus)分离到一种hepcidin抗菌肽新基因,并在国际GenBank公布(accessionnumber为AY547281).初步研究结果表明,在我国鲈鱼分离到的hepcidin基因属于hep cidin抗菌肽基因家族的新成员.     

血涂片中出现有核红细胞的临床意义

目的观察血涂片中出现有核红细胞的病因及临床意义，方法新鲜血片经瑞氏，姬姆萨染色，光学显微镜镜检，结果100例血片中出现有核红细胞的病例分布于12种疾病中，结论：观察血片中有核红细胞的形态，对某些疾病的诊断有重要的临床意义。     

The developmental sequence of Argulus foliaceus (Crustacea: Branchiura)

We describe and illustrate the complete development of Argulus foliaceus L. A metanauplius is followed by nine juvenile stages. Eggs were detected in the thorax of the female at the 11th stage. Comparisons are made between the development of A. foliaceus and the other freshwater species of Argulus currently found in the UK.     

未成年人犯罪非刑罚矫正制度比较与借鉴

美国、英国、德国、澳大利亚及我国港澳台地区的未成年人犯罪非刑罚矫正制度都比较完善，相比之下，我国大陆此方面制度简单而滞后。我国大陆应该在制度的完备性、独立性、方式的多样化与灵活性、参与主体的广泛性和矫正原则贯彻的力度应对上述国家和地区的作法上进行借鉴。